Solid web for artificial tooth backing



` :kar-.legalite .7,1 193e;

Application December l `It -is @known-'that ngletooth-supports-mayfbe w pressed by thedentist himself, using fldediplatel stripsyfthe e'rldsot which are bent over.` These d iturned ends,` howeverfaretoo weak since they f5 'caribe `made only half the strengthoiV a tooth#V lsupports ,neck. The apparatus that have beenconstructed for this purposeso far aretoo experu sive and, being dependent `onwtheslrill of the `p`ro`V ducer, they'turn outproductsthatdilerin qualy 0j ity,`i. eg. they turn` outunpreciselprogducta p First lv l of'all,` howeventhe timerequired forthemaking of such single tooth-support isarwtoo long,` and when solderingthe tooth-support to the limgcking,` Y theV solderowing` to` `the effect of ``:apillarityf` easilyruns off along thegaps and between the two plate-strips of the tooth-supports neck,"ooding, thereby-the tooth-support'with solder and 'spoil-f irlgthe whole work beycndrepairl'V l" l l It `is knownl that part of these derlciencies may be V{Marcome by using tooth-supports `"or` bars l that arefmassive andiconsist o1 a head and a neck; which latter widens conically' atitsbottom'.` If, now, the tooth-'supportsare'not madeeachsingle support byitself, but if an elongated baris Aformed;` by diyisionof whichjinto sections theysingle sup-:V .ports are ,vsmplyfslioed offlas may be desired; ay timef trom l10 tog-15 seconds is all thatniay loe-pv eckonedwith 'for the making f of:` Vone u single .supp d )portV out -ofunformed llrietaLl nSuch` supportsior o `bars may be made'fronrmelted metal by means d d of a moulding forni, ori'rorn -unforrned raw metal, for from wire-or bars by means of `a pressing fox-in, v l for `preferably by some Vdrawing form, such asI a'- drawing-iplate or a formingroller. The great disy 35 `advantage howevenis that supportsfconsisting of' a head and a neck'having a conically lwidened `end. cannot be'connectedto thebacking byeither Ysoldering nor by any otherkind of'method. On

.fthe contrary,` abacking of `melted metal hasto be l j 0 cast `to the necky of the tooth-support. To-that fend aire-proof `matrice is needed, which has to -vbemadefanew uall overfagain, each timeit is to e used.` -lSIotto4 mentionthe factthatfthecast metal is much less durable than therolledyariety, V"fartoo longa timezisrequirediorthe making otu fthe ."BSDE `flr'laf!" the illlbtddiner` drying.

i come necessary forV butla single tooth;` taking two hours ormoreplr `r' l d -w l The inventionrhas or-Vitsfobject'tolproduce n@ solid webor web" bar` partible intd thebarlengths required and .oti such cross section ,thatbyladjusting-and shiftingzby hand `poi. the webmade'in they i `length required,xor cutotllfrom the web'bar in the that, when Virreal-ing on one "sideloron both"sides fagainstl the back plate, the-twocorrect.distances` l` ofthe webv head from thejback `plate are deterl, mined andtheverticalposition oi' the web to the.

f L :f Fig14 shows y serted into a back plate. *y

" serves to receive the facette, `hasbeen provided v l atboth sides offits back end` with a protruding i itspositlonby the'b'ottomepiece c andthenecklb f any apparatus whatever;

VLguide ledge'olhasbeenjprovided; 0n each sideof Y neckbfandat right angles,"`inlfront of-thezpalr of j 1 d d d d 'isrpreferablm ldenticaf'with thefthickness ohn d length required; ina slot" made bynjieans of` a requiring at the utmost one-to two minutes and` .theback plate andtherefore' also the `facette p i standing accurately 'at `right angles to the webf With this object inview one orisevlerallungi-y` t tudinal guide ledges are arrangedat right angles toandfonthe neck of theieolldweb or of the lsolid j j web Aharand atfsuch heightbnthe neck, which is' extended at least'by the vthi-lrnessof` thebacl:` plate; preferably however beyond theyV thickness.V

backplateisensuredu; d l l. d lTwo`embodiments"oftthe"intention areillus-"F trated on alarger scale bywaygotvexamplelin the Y accompanying drawing-in whichz- A Fig. l'is a verti aifctionthrough aL/web bar Flg`.2is a'verticalsectionthroughthe 'samewepff' barinsertedintoabacirplate. y f l" d 1 Eig, 3 is a `vertical section througlranother wel;V bar alone,V

l In the form shown in Figs. land ZQnecIr'bjfofff d thefweb orf'web bar lying behind head a,'which longitudinal guideiedge c; so that:theneclY of the web"or web bar takes on thefshape of aT. When the webor web bar is inserted into the backin'gdd, g

[which is provided witha slot atthe edge.` the two longinueinanedges gripbe'hmd said melding.A The" A insertingis donevin aMfree-handed manner. The 49" webor*webbaronce insertedlinto; the slotted bsckmg-tilebackmg is nml-uien..` .r y p Itionly-hastobe soldered'n'ow. It seenv ybylllg. 2 ythat the backing is so Securely'xed in y `that anyv change ofpthatfposition quite-Ime l possible when` the` subsequent soldering: takes p' Q`place,which latter is done byihand and without w31 t Y Inthe form shown inlFlgsj and 4, another-5o l" guide ledges at'the' back and at a distance'which y Y, receding. This is achieved by an arrangement which gives a smaller Width to part e of the neck Y lying between both pairs of longitudinal guide ledges than to part bof the neck which lies before them. The back, part of the neck 'is therefore Y v If the backing d proyidedwithapslotis freelyY insertedfinto'such-support, as shown in Fig. g4,

l theffbacking is ready Yfor use.' Any soldering be'- comes unnecessary,V for, as shown in Fig. 4, the

- backing is securely and unmovably claspedvbyv two'T-pieces: at the top, by the T-memberfof the neck, at the spot where its diameter begins to "get thinner, and'at the bottom,- by the Tj-member u extending on both sides of the web, said web forming the bottom-piece'c on the neck.

: Should the-caserequire'it, the two longitudinal I 'guiderledges C1 may be employed alone too;

' VWhatl claim as new and desirefto seureby Letters Patent' is:

hacking having a r slot therein whose sides are f "straigh't, agyv'eb barhaving ashank of reduced area atlitsflotverfnd iitted the'slotfof the .to the axis of the shank and at4 the upper portion Y backing, the said shank terminating in a ledge of the reduced portion thereof fitting against the plane surface ofthe hacking opposite. that enl gaged by the ledge.V

2. In a device of the kind described, the-combination with abacking plate having a slot extending therethrough from one edge to a point spaced from the opposite edge, and a'solvid rail preformed to provide a head, a web and a base i`ittingthe-slot in ther plate with the head spaced fromitheplate and the base fitting closely against of 4'said web being longitudinally grooved to t closelyV on the portions of the plate atthe sides ofthe slot. j I i f ,fRUDOLF',BATH. 

